Measurement of C1q antigen levels; C1Q / Complement C1q, Serum,
is key to the differential diagnoses of acquired or hereditary
angioedema. Those patients with the hereditary form of the disease
will have normal levels of C1q, while those with the acquired form
of the disease will have low levels.

Studies in children show that adult levels of C1 inhibitor are
reached by 6 months of age.

Day(s) and Time(s) Performed

Monday through Saturday; Continuously until 3 p.m.

Analytic Time

1 day

Specimen Retention Time

7 days

Test Classification

This test has been cleared or approved by the U.S. Food and Drug
Administration and is used per manufacturer's instructions.
Performance characteristics were verified by Mayo Clinic in a
manner consistent with CLIA requirements.